Combined type-writing and computing machine.



GJO. DEGENER.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED OCT-31.1912.

Patent-ed Mar. 26, 1918.

s SHEETS-SHEET I.

G. 0. DEGENER.

COMBINED TYPE WIRITING AND COMPUTING MACHINE.

APPLICATION FILED OCT-M11912.

Patented Mar. .26, 1918.

6 SHEETSSHEET 2,

G. O. D.EGENER. COMBINED TYPE WRITiNG AND COMPUTING MACHINE.

APPLICATION FILED OCT. 31, 1912.

Patented Mar. 26, 1918.

6 SHEETS-SHEET 3.

Q s A NNN g I QQN RN? g R mmw z k o M 6% m k w \HQ x G. 0. DEGENER.COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED OCT. 31.1912- Patented Mar. 26, 1918.

6 SHEETS-SHEET 4,

e. 0, DEGENER. CQM'BINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED OCT. 31, 1912.

Patented Mar. 26, 1918.

6 SHEETS-SHEET 5.

6-, 0. DEGENER. iJOMBINED TYPE WRITING AND COMPUTING MACHINE.APPLICATION FILED OCT. 31, 1912.

1,260,759. Patented Mar. 26, 1918.

6 SHEETS-SHEET 6.

V E N 411mm I run IINITEEE STATES I ?ATENT QI IEIQE.

GUSTAVE O. DEGENER, OF HE'W YGRIZ, N. Y., ASSIGNOR T0 UNDER'WQODCOMPUTING MACHINE COMPANY, OF NEW' Y OBI-i, N. '1 A CGRPGEATIQN OF NEWYORK.

COMBINED TYPE-WRITING AND CGMPU'IING MACHINE.

Specification of Letters Patent.

Patented Mar. 26, 1918.

Application filed October 31, 1912. Serial No. 728,803.

To all whom it may concern:

Be it known that I, Gos'rnvn O. Dncnnnn, a citizen of the United States,residing in New York city, in the county of N v York and State of NewYork, iave invented certain new and useful Improvements in CombinedType-l Vriting and Computing Machines, of which the following is aspecification.

This invention relates to computing machines of the kind in which asingle set of numeral keys controls the operation of a master wheel ormember which is adapted to operate in succession upon the dial wheels,and preferably in which the numeral keys form part of a typewritingmachine.

The improvements are illustrated in con nection with a machine disclosedin the United States Patent No. 1,020,082, granted to me March 12, 1912,although many of the improvements may be used in other machines.

In said patent the master wheel, which works upon the dial wheels, isconnected to an index wheel, which carries a set of index pins andconstitutes a gear. I Vith this gear meshes a motor-driven pinion, theindex pins constituting the teeth of said gear being under the controlof said numeral keys, so that any pin may be displaced so as to mutilatesaid gear. VYhen the gear is mutilated at any point, the motordrivenpinion cannot. turn it beyond that point. When an y numeral key isdepressed, the gear is restored at the previously mutilated point, andmutilated at a new point at a distance from the old point correspondingto the value of the key struck. The pinion can then turn the gear untilthe point is reached where the gear has been just mutilated by the lastoperated key; at which point the gear is arrested and the pinionrevolves idly, said gear being arrested by a stop which engages one endof the lastdisplaoed index pin.

In said patent, the rotation of the comput ing wheels is delayed untilthe type key, upon its return stroke, permits the feed of the typewritercarriage, which in turn permits the computing wheels to rotate.

One of the features of the present invention is to provide simple andeffective means for causing the computing wheels to begin rotationduring the down-stroke of the key, and to complete the rotationindependently of the up-stroke of the numeral key. To

this end, in this specific instance, the index wheel or mutilated gearis restored during the down-stroke of the key; and during the samestroke, the motor-circuit is closed and the motor-pinion rotates theindex wheel, together with the master wheel and dial wheel; and theremaining movements of these parts proceed to completion independentlyof any further movement of the depressed numeral key; the index wheelbeing arrested by means of the last-displaced index pin thereon, themotor-driven pinion becoming disconnected from the index wheel, themotor-circuit being broken, and generally the parts which are common toall of the numeral keys being returned to normal positions in advance ofthe return of the numeral key itself to normal position. When the key isreturned, it is re-connected by means of a latch or trip mechanism tothe general members of the computing device.

A further object of the invention is to lighten the touch of the keys,and to that end I cause the work to be performed by the motor whichheretofore has been performed by the fingers of the operator. Preferablythe depression of any numeral key of the typewriter releases a1nasterspring, which performs various functions, as will hereinafterappea and finally, by means of said spring, a cam is clutched to amotor-driven shaft, and caused to re-set said masterspring ready for theoperation of the next. key, this rc-setting being done independ ently ofthe return of the key to normal position; and the aforesaid trip orlatch mechanism operates to re-connect the same so that it may releasethe master-spring to perform the various functions referred to.

A further object of the invention is to prevent errors in computationwhich are liable to arise by reason of the vibrations of the typewritingcarriage which occurs at the completion of every letter-feedingmovementthereof, by reason of the light construction and springiness ofthe parts. I cause the aforesaid master-spring to call into operationtwo justifying dogs, which engage racks, one on the main-adding machinecarriage, and one on the cross-footing carriage, (although the lattermay be omit ted when no cross-footing is performed). These dogs justifythe computing carriages or bring them to exact positions, and alsotemporarily lock the same positively against displacement in eitherdirection, so that there is no liability of the master wheels acting onany except the proper dial wheels. These dogs and the other deviceswhich are common to all the numeral keys, are restored to normalpositions by the power of the motor, in the manner already referred to.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure l is a side elevation of an Underwood typewriting and computingmachine embodying the present improvements, and showing the parts innormal positions.

Fig. 2 is a detail of the mechanism for an tomaticaily justifying andlocking the comp-uting carriages against movement while the wheels arebeing operated.

Fig. 3 is a front'perspect-ive view of the computing mechanism seen atFig. 1, the parts being in normal position.

Fig. 3 is a perspective of one of the justifying dogs for themain-adding machine carriage. V

Fig. this a plan to show the justifying dogs and racks for the differenttotalizers.

Fig. 5 is a perspective view to illustrate the latch-mechanismre-connecting the numeral keys to the adding mechanism before the lastdepressed key has been released; the latch mechanism comprising atemporary catch 125 for this purpose.

Fig. 6 is a front perspective view of the mechanism connecting themaster-spring to the feeding mechanism of the typewriter carriage, toinsure that said feeding mechanism shall not complete its feeding strokeuntil after the computing wheels have completed their rotation.

Fig. 7 is a'sectional side elevation of one of the totalizers commonlyused in said Underwood machine. I

Fig. 7 is a plan of certain gears com monly forming part of thetens-carrying mechanism in said Underwood machine.

8 is a sectional elevation of the typewriting mechanism showing some ofthe ing been set by a key.

Fig. 11 is a view similar to Fig. 10 showing a ack-setting blade ashaving been swung idly from the Fig. 10 position, dur-'- ing thecompletion of the clown-stroke of the key.

Fig. 12 is a sectional elevation showing a guide for the ends of theackswhich set the index pins; the index pin wheel being. freely rotatablenotwithstanding the fact that a jack is in position, since the latter isyieldingly mounted, and may be forced aside by the remaining index pinsas the wheel rotates.

Fig. 1-3 is a sectional plan of the computing mechanism.

Fig. 1e is a plan of a normally open clutch between the motor-drivencounter-shaft 90 and a cam 118 which restores the masterspring referredto; the parts being in normal positions.

Fig. 15 shows the clutch closed and the cam as having been rotated andthe clutch as about to re-open.

Fig. l5 illustrates the method by which the clutch is caused to open.

F 16 is an elevation to show the clutch mechanism of Fig. i l and itsconnection with the index pin wheel, which controls the closing of suchclutch; the parts being in normal positions. i

Fig. 16 is a view likeFig. 16, but showing the index pin wheel as havingclosed. said clutch.

Fig. 17 illustrates the manner in which the last-projected index pin maycrowd aside the hammer or arm, which subsequently restores such indexpin to normal position at the down-stroke of the numeral key.

Fig. 18 shows the master-spring hav ing been released, and the indexwheel as having been rotated and about to close the clutch to the Fig.15 position, just before the index wheel comes to a stop.

Fig. 19 is a sectional front elevation of certain gears and cams whichare operated by the master-spring.

Fig. 20 is a plan showing an annular helical spring holding the jacksnormally in their outer positions at 12.

Fig. 21 illustrates the manner in which the revolving index pins crowdaside a yielding jack 20 when it is held in working position by adepressed numeral key. i

Fig. is a perspective view of one of the jacks.

Fig. 23 is asectional plan to illustrate the connection between thecross-adder and the typewriter carriage.

Fig. 24 is a perspective View of the hook which intermittently connectsthe crossadder to the typewriter carriage.

Fig. 25 is a side elevation of one of the adjustabl lugs on thetypewriter carriage for connecting with the hook seen at Fig.

Fig. 26 is a sectional rear elevation showing the index pin wheel ormutilated gear, the motorpinion for driving the same, the clutchmechanism for connecting the pinion to the motor, and a device torestore the previously projecting index pin.

Fig. 27 is a fragmentary perspective View showing the relation of themutilated pin wheel or gear and its driving pinion.

Letter-type keys 1 and numeral type keys 2 are mounted on levers 3,which, by means of sub-levers 1, are connected to type bars 5, to swingthem upwardly and rearwardly against a platen 6. This platen is mountedon a carriage 7, propelled by a spring barrel 8, and having a rack 9meshing with a pinion 10, to which is connected an escapement wheel 11.This wheel is controlled through the usual alphabetical and other typekeys, including the keys 1, 2, to cause the carriage to feed at everytype stroke. For this purpose, dogs 12, 13, engage the wheel 11, andthese dogs are rocked or controlled by means of a universal bar frame14, which is pressed rearwardly by heels on the type bars.

The numeral keys are connected by links 16 to a set of bell cranks 17and the latter, through links 18, rock levers 19, which operate jacks 20grouped in a circle. Any jack may push out any of a circular series ofpins 21, which are carried by a drive wheel 22 connected to thecomputing wheels and capable of turning any thereof, having a functionsimilar to that of an index pin wheel in a gear cutter. The pins aredetained in either normal or projected positions by a coil-spring band21*, engaging seats or grooves 21 in the pins, Fig. 10. These pins 21perform the function of gear teeth. Meshing therewith is a drivingpinion 23, which may be connected to a motor 2 1 by means of bevel gears25, 26, shaft 27, and bevel gears 28, 29. The driving pinion 23 may befixed to a shaft 30'on which it turns, this shaft being, however,displaceable endwise for a purpose presently to be explained.

The gear is loose on the shaft 30, and is fast to one member 31 of aclutch which is normally open, the other member 32 of said clutch beingsplined to said shaft at When the clutch is closed, power iscommunicated from the motor shaft 27 through the driving pinion 23 tothe gear comprising wheel 22 and its pins 21, to rotate the same, forthe purpose of effecting a computation; there being provided upon theshaft of said wheel 22 abevel pinion 3%, Fig. 1, to mesh with a bevelpinion 35 on shaft 36, which is connected by bevel pinions 3'? and 38 toa vertical drive-shaft 39, which has suitable connections to bevelpinions 40 and 4:1 upon shafts 12 and d3, which carry respectivelyinternal master wheels 44- and 4:5 in upper and lower computing heads 151-5". It will thus be seen that the efiect of the driving pinion 23 isto rotate, through the described gearing, one or more master wheels 44,415, turning the pinions 44 and dial wheels 44* (Fig. 7 in theirrespective computing heads or totalizers, the master wheels and dialwheels having a relative step-by-step movement to correspond with thestep-by-step movement of the typewriter carriage.

As set forth in United States Patent No. 1,020,082, granted to me March12, 1912, the wheel 22 is arrested by the engagement of the end 21 ofthe las -projected pin 21 with a counter-stop 46, xed on the framework.The distance through which the wheel 22 is rotated is equal to thedistance between the last-projected pin 21 and said counter-stop at Tl ejacks 20 are placed in such positions that the depression of any numeralkey 2 will cause the projection of an index pin 21 at such distance fromthe counter-stop 16 as to cause the subsequent rotation of wheel 22 tobe equal to the number of steps indicated by the depressed key 2; sothat the master wheel 1 1 or +15 or both may be rotated a correspondingdistance. Rebound of the index wheel when a pin strikes the stop isprevented by a pawl 46, Figs. 1 and 13, which engages the unset pins 21.

The clutch 31, 32, between the motor and tie computation wheel (or indexpin wheel) 2 is normally open, but a spring 17 (seen at the lower partof Figs. 1 and 6) tends normally to close said clutch; said springpressing up against a vertically sliding rack member 4:8, which, bymeans of mutilated pinion 49, Fig. 19, and mutilated gear 50, turns apinion 51 which is fixed on a horizontal rock shaft 52; the lattercarrying a cam 53, Figs. 1, 3 and 26, to rock an arm 5-1, to shift saidclutch member 32 to close the clutch. The arm 5st has a projection 55engageable by a cam-edge 56 upon said cam-plate 53 to swing said arm 5%to close the clutch, whenever the normally restrained spring 47 ispermitted to lift the rack 18. It will be noticed that the arm 5-1 isalso provided with an extension 57 to engage with a cam surface 58 onthe plate 53, for retracting the arm and thereby opening the clutch atthe return movement of said rock shaft 52 to normal position.

Said spring 47 is normally restrained from closing the computation wheelclutch 31, 32, by means of a device which comprises a segment 59,meshing with rack-teeth 60 on said rack or slide 18, and fixed upon ahorizontal rock shaft 61, which also has fixed thereon long arm 62, uponthe free end of which is pivoted a latch 63, normally caught under catch651-, the latter being movable to release said latch, and being for thispurpose placed under the control of the ral keys. It will be noticedthat each or toe key connections 18 carries a head 65. and these heads,being grouped in a circle. nay each engage a universal disk or plate 66and move the same; this disk being suppart of the down-stroke of the key2, and while the jack 20 remains projected into the path of therevolving circle of unset index pins 21.

As seen at Fig. 10, the operated jack 20 has reached a position, at theconclusion of its stroke, very eccentric to the index pin 21, and theconsequence is that when the wheel 22 rotates, the index pins may eachengage the periphery of the jack (which may be of cylindrical form) andcam or force the same to one side, that is, inwardly toward the centerof rotation of the wheel 22; the frame 80 having radial guidingslots 88for the free ends of the jacks, thus permitting the camming of theprojected jack to one side, as illustrated in one instance at Fig. 12.Hence the index wheel 22 and the master wheel or wheels connectedthereto may be rotated, and their movements may be completedindependently of the return of the key to normal position, and in factin some instances before the key 2 really completes its down-stroke.

A. coiled spring 89, arranged in the form of an annulus, is compressedwithin the circle of jacks 20 at their free ends, and by tending tospread, holds all of the jacks lightl in their outermost positions. Thisspring will yield to permit the shouldering aside of the projected jackby the successive unset index pins. Upon the release of the key, thespring 89 will snap the free end of the jack out to the end of its slot88 in its frame 80, this being the normal position of the jack.

It will be remembered that the power of the spring 47 is used to closethe clutch between the motor and the index wheel 22, and also to restorethe index pin 21 that had been previously set. This spring is itselfre-tensioned by power derived from said motor 2%. The power forretensioning the spring, and returning the parts that have been operatedthereby, is derived from a counter-shaft 90, which is connected by abevel pinion 91 to a bevel pinion 92 on the motor shaft 27. It will benoticed, parenthetically, that this shaft 90 is used for operating theusual auxiliary tens-carrying mechanism of the Underwood combinedtypewriting and computing machine; being for this purpose connected by apinion 93 to a pinion 94; on vertical shaft 95, which is connected byreversible clutch mechanism to upper and lower pinions 96 and 97 ontenscarrying drive shafts 98, 99.

'Cn said counter-shaft 90 is a normally open clutch which at the propermoment, is closed, to enable the counter-shaft 90 to re-tension thespring 47 and restore its associated mechanism to normal position. Thecloser or controller for this clutch is in the form of a T-shaped arm100, pivoted at 101 on the framework, and having a roll 102, which, bymeans of a spring 103, is caused to bear constantly up against a cam101, Figs. 3, 16 and 19, whereby said clutchcloser 100 is normally heldin the Fig. 1 position against the tension of said spring 103. This cam10 is rigidly attached to mutilated gear 50; and when the latter isturned (by spring 17) in the manner already described, the spring 103 ispermitted to raise tle roll 102, owing to the shape of the cam; and theupstanding arm 100, which carries a latch 105, is swung over to theposition at Fig. 18, when it is snapped by means of a spring 106 overthe edge of a clutch-closing arm 107, the latter pivoted at 108 on theframework, and having two projections 109 to engage a collar 110 on themovable member 111 of the clutch on said counter-shaft 90. The latch 105is now in position for swinging the arm 107 to engage the movable memberof the clutch to close the same.

The closing of this clutch is finally effected by means of thelast-projected index pin 21 or 21, just before the latter is arrested bythe counter-stop 16. An arm 112, rigid with the clutch-closer 100, isprovided with a cam-edge 113, which normally, as at Fig. 16, is clear ofthe projected index pin, but which, when said clutch-closer 100 is swungfrom its normal position at Fig. 16 to the position at Fig. 18, is alsoswung so as to lie diagonally in the path of the advancing index pin 21which was last projected, so that the same may engage said cam, and, byreason of the continued rotation of the wheel 22, may force theclutch-closer 100 back to normal position, whereby the latch 105 on saidclutch-closer is caused to close the clutch, as at Fig. 16

The movable clutch member 111 is splined at 11 1 to the counter-shaft90, and the cooperating clutch member 115 is loose on said shaft, havingapin 116 to engage a peripheral groove 117 on the shaft, to preventendwise displacement of the clutch member 115. Upon the latter is acam118, which is normally stationary, but which now makes a revolution.and, by engaging a roll 119, rocks an arm 120 pivoted upon a stud 121fixed on the framework, and having a returning spring 120 Said arm 120forms a portion of a bell crank, the other arm 122 thereof striking downa shoulder or tappet 123 formed upon an upstanding rod 124, which at itslower end is rigid with the rack member 48, whereby the latter isdepressed to normal position, thus restoring the parts 50, 51, 42, 76,53, 54-, 32, 75, as well as the latch arm 62. The latch 63 now catcheseither upon the catch 6% or (if the numeral key 2 be still depressed)upon an auxiliary catch 125 provided upon the catch 61 at one sideth'ereotias at Fig. 5; a spring 126 causing the latch 63 (which ispivoted at 127 upon.

the arm 62) to snap under either catch 6a or 125. Itwill of course beunderstood that upon the subsequent relief of the key 2 from pressure,the latch 64; will swing back from the Fig. 5 position to the Fig. 3position (under the influence of spring 63) so that the latch 63 willslip 0% from the catch 125 onto the catch Get, as shown in normalposition in Fig. 3.

A spring 128 returns the pin-restoring arm 75 to normal position as thecam 7 6 is retracted. This spring is offset or diagonally arranged, asit is also used for rocking the arm 75 facewise after the latter hasbeen pressed aside by the advancing projected pin 21 at the time thatthe latter is cammmg over the arm 112. The arm 7 5 is fitted loosely onits pivot, as at 129,- to permit it to be displaced or pressed asidefrom the position at Fig. 18 to the position at Fig. 17, when thelast-projected pin 21 is approaching the counter-stop 16, as aforesaidThe cam 10-1, when being returned to normal position by the rack 18,rocks the clutch-controlling arm 100 slightly away from the projectedindex pin 21 leaving the latter free to be subsequently thrust intonormal position by the arm 75. To permit the arm 112 to be swung awayfrom the index pin, as at Fig. 16, after the clutch 111, 115, is closed,the arm 100 is made in two parts pivoted together at 130, the upper part131 carrying the clutch-closing pawl or latch 105, and the two partsbeing held to= gether by a spring 132, with the pivoted part restingagainst a stop 133 on the main arm.

, As soon as the bell crank 120, 121, thrust downthe shoulder 123 andthe restoring rod 12%, the power-driven countershaft 90becomes-disconnected from the restoring mechanism. For this purpose atappet 131 on the'cam 118 engages a lip 135 on pawl 105, which lip has abeveled tip as indicated at Figs. 14, 15, and 15 so that the tappet 134;may cam the pawl. or latch away or free from the arm 107, as at Fig. 15thereby releasing the arm and permitting a spring 136 to restore themovable clutch member 111 to normal open position; 136 being acompression spring coiled around the counter-shaft 90 and workingbetween. the normally stationary clutch member 115 Y and. the movableclutch member 111. The

face of the arm 107 may-be so broad that the tip of the latch 105 maycontinue to rest thereon when the parts are in normal positions, Fig.ll.

spring, and engages a roll 138- carried 105F311 circuit and also restrin the link 1 11 and arm 139 to normal positions. it is not howeverdesired to break the circuit and thus stop the motor until after the cam113 has completed its function and returned to nor mal position. Thework of the cam 137, Figs. 1 and 3, in holding the circuit closed as itmoves away from the arm or bell crank 139 is taken up by the bell crank120, 122, as it rocks in carrying the rack 48 and the cam 137 downwardto their normal position,

through the intermediary of a link 1 18' which is connected to the bellcrank 139 and the bell crank 120, 122. The link 1148 has an idle motion,as by having a pin-and-slot connection with the bell crank 120, 122, sothat the circuit can be closed at the initial depression of a numeralkey, through the action of the cam 137, without disturbing the bellcrank 120,- 122. After the cam 118 has completed a rotation anddisconnected the pawl or latch 105, the spring 120 will return the bellcrank 120, 122, breaking the circuit, and thus stopping th motor.

It will be seen that the depression of a numeral key 2 not only projectsthe corresponding index pin, but also causes other described operationsto be performed, and among others the closing and opening of themotor-circuit independently of the release of the key. 1

The totalizer 45 is mounted upon a carriage 150, which is connected tothe type- Writer carriage 7 by a bracket 151, Fig. 1; the master wheel15 being stationary while the carriage travels. To prevent the travel orany displacement of this carriage while the computing wheels areturning, there is provided a dog 152, toengage any of the notches in arack 153 mounted upon the totalizer 45*. This dog is mounted upon a rockshaft 15 1, which at one end is provided with a segment 155 to mesh witha rack 156 on anextension 157 of the upstanding rod 124. The firstmovement of said rod 12 i is upwarchthereby rocking the dog 152 forwerdly into mesh with the rack 153, as in Fig. 3 and holding the totalizer45 securely against endwise movement. When the rod 124- is subsequentlydriven down by the restoring arm 122', the dog 152 is rocked out ofmesh, thus leaving the totalizer free to travel one letter-space withthe paper can riage 7. The dog is beveled as at 152, Fig. 2, to act a ajustifier to bring the carriage to true position before locking thesame.

The cross-totalizer 45 is stationary during the letter-feeding movementsof the carriage, but the master wheel 15 thereof is adapted to have astep-by-step movement, being for this purpose connected to a carriage158, and the latter being connected by a cross-lever 159 to a hook 160,Fig. 23, adapted to engage and disengage in succession certaincolumn-stops 161 on the typewriter carriage, Fig. 23, to perform crossaddition. Upon the master wheel carriage 158 is provided a rack 162, anda beveled dog- 163 mounted upon a rock shaft 16%, the latter having a se'meiit 165 to mesh with a rack 166 on the extension 157, Fig. 2, so thatthe dog 163 is rocked into mesh with he rack 162 simultaneously with themovement of the dog 152 into mesh with the rack 153 on the totalizer 45,so that the master wheel at is first brought to true position and thenprcventct from displacement dur- 'ing its rotation; the dog 163thereafter releasing the rack 162 simultaneously with the release of therack 153.

A connection is also preferably made to the typewriter carriage or tothe feeding mechanism thereof, to control the same so as to insure thecompletion of the rotation of the index wheel 22 before the ty ewritercarriage starts to feed. For t iis purpose a second rack 107, Figs. 6and 18, is formed on the rack member d8, which is driven by said generaldriving spring +17, and a seg ment or lever 168 connects the same to apinion 169 fixed on av rock shaft 170, which has an arm 171 arovidedwith a pin-andslot connection at 172 to an arm 173, the latter fixedupon rock shaft 17%, which carries an upstanding arm 175 having a roll176 to engage a cam 177 on an arm 178 fixed upon the rigid dog 12 of thecarriage-escapeinent mechanism, wl ereby wl en said rack member 48 islifted by the spring e7 as aforesait. the rigid or non-feeding carriagedog 12 isv moved rearwardly into engagement with escapement wheel 11;this movement being independent of the typewriter universal bar 14's,although one movement may accompany the other. The dog 12 is held 1nthis position, and the type *riter carriage 7 is therefore preventedfrom advancing, until the return of the rack member 48 to normalposition, which, of course. occurs after the restoring members 120, 122,have been operated by the power-driven cam 118 upon the completion ofthe rotation of the index wheel 22. in the rapid operation of the keys,this release of the rigid dog 12 may not occur until the numeral typebar has returned a substantial distance to normal position, and hencenot until after the universe-l bar 1 1 has been returned fully to itsnormal position by the usual spring (not shown).

It is to be noted at this point that it any of the locks for holding thetraveling elements of the computing mechanism or the travelingtypewriter carriage against movement during a computing action, shouldnot be able to operate, as, for example, when the master wheels were notin register with the computing wheels which they were to drive, butbetween two of said wheels, then, of course, through the connectedlinkage the rack bar 48 would be prevented from moving upward under theimpulse of the auxiliary power spring 47, thus preventing the initiationof a computing action. This, then, forms av safety device preventing therotation of the master wheels by the motor at times, so that anincorrect computing action or disriuiting action would not take place.

As is usual in said Underwood machine, the shaft 98 carries a pinion179, meshing with a pinion 180, which is connected to a pinion-barrel181, which may turn idly, but u is adapted to engage teeth 182011 atenscarrying member 183, which is started by a tens-carrying tooth 18%,of which one is as usual connected to each computing wheel 44 Variationsmay be resorted to within the scope of the invention, and portions ofthe improvements may be used without others.

Having thus described my invention, I claim:

1. in a computing machine, the combination with computing mechanism, ofactuating mechanism therefor normally disconnected therefrom, a seriesof numeral keys, power mechanism for connecting said computing mechanismand said actuating mechanism under control of said numeral keys, andautomatic means brought into action at the completion of a computationfor restoring power in said power mechanism.

The combination with computing mechanism, of actuating mechanismtherefor normally disconnected therefrom, numeral keys, power mechanismfor connecting said actuating mechanism with said computmg mechanismunder control of said mimeral keys. said actuating mechanism acting tocarry out the computation as determined by the selected keys, leavingsaid keys free to return to their normal position while said powermechanism finishes the work assumed, and automatic means dependent forits action on said computing mechanism completing a computation forrestoring power in said power mechanism.

3. in a computing machine, the combination with computing mechanism, ofa source of power for driving said computing mechanism, a clutch forcontrolling the effectiveness of said source of power to drive saidcomputing mechanism, shifting means for said clutch, a cam for actuatingsaid shifting means, a shaft for said cam, a gearing on said shaft, arack, gearing connecting said rack with said first-mentioned gearing, aspring for operating said rack, restraining means for preventing theactuation ofsaid rack by said spring, numeral keys for controlling theaction of said computing mechanism, and connections enaloling saidnmneral keys to control said restraining means.

In a computing machine, the c0mbination with computing mechanism, of acomputation wheel for determining the extent of movement of saidcomputing mechanism, said wheel having a series of pins constituting amutilatable geaignumeral keys for setting any of said pins to therebymutilate said gear, the set pin serving as a stop, which. pin must bereset to again complete said gear to start a computation, and powermeanscontrolled by said keys for resetting the previously set pin to therebystart a computation.

5. In a computing machine, the combination'with a rotary indexing wheelhaving a series of pins settable to determine the extent of rotationthereof, the stopping point of said wheel being determined by theposition of a set pin thereon, of restormeans for unsetting a set pin;yieldingly he-d in juxtaposition to said wheel so as to bepushed out ofthe path of rotation of any set pin.

'6. The combination with a plurality of computing heads having separatetraveling carriages, of numeral keys for determining the computationcarried on by said computing heads, locking means individual to theseparate carriages for holding them against traveling during the runningup of a computation started by said numeral keys, and actuating meanscommon to said individual locking means brought in play at the actuationof each numeral key to manipulate all of said locking meanssimultaneously.

7 The combination with a computing head, of a series of controllingnumeral keys, locking means for holding said computing head in registerduring the running up of a number, means for releasing said lockingmeans, and timing means for delaying the release of said locking means,even after numeral key has returned, until after the number has beencompletely run up on said computing head.

8. The combination with a computing head having a traveling element, ofa rack on said traveling element, a dog arranged to engage between theteeth of said rack, shaft for swinging said dog, a segment mounted onsaid shaft, and a rack engaging said segment to rock said dog into andout last-mentioned rack, and numeral keys for" controlling the runningup of numbers on said computing head and also controlling the action ofsaid spring.

10. The combination with a computing head having a traveling element, ofa dog for locking said traveling element against movement, areciprocating member for manipulating said dog, a spring for actuatingsaid reciprocating member, locking means restraining the actuation ofsaid reciprocating member by said spring, and numeral keys forcontrolling the running up of numbers on said computing head and alsoacting to release said locking means.

11. The combination wi h a plurality of computing heads each having atraveling element, of a dog for locking each of said traveling elementsagainst movement, a rock shaft for each of saiddogs, a segment for eachof said rock shafts, a rack member common to all of said segments, aspring for actuating said rack member, locking means for restraining theaction of said spring, and numeral keys for controlling the running upof numbers on said computing heads and also acting to control therelease of said locking means.

12. In a computing machine, the combination with a typewriter carriage,of comput ing elements including a computing head and a master meanstherefor, said master means and said computing head having relativetraveling movement and said computing elements being remote from saidtypewriter carriage, a connection from said typewriter carriage to oneof said computing elements for controlling said relative movement,locking means effective on one of said computing elements for preventingtraveling movement between said computing head and its master means, alock at the typewriter carriage for preventing m vement thereof andmeans for rendering effective both of said locks and maintaining themeffective during a computing action.

13. In a computing machine the combination with a typewriter carriageand es.- capement mechanism therefor, computing elements including acomputing head and a master means therefor said master means and saidcomputing head having relative traveling movement, said computingelements being situated remote from said typewriter carriage, aconnection from said carriage one of said computing elements forcontrolling said relative traveling movement, locking means effective onone of said computing elements for preventing traveling movement betweensaid computing head and its master means and means for rendering saidlock effective during computation and concomitantly locking saidtypewriter carriage through said escapement mechanism.

1-l-. The combination with a wheel having a series of pins adjustablymounted thereon so as to be set from one position to another, means forrotating said wheel, and a series of jacks for setting said pins, saidjacks being loosely mounted so as to permit them to be cammed out of thepath of said pins while in their actuated position during the rotationof said wheel.

15. The combination with a rotatable wheel having a series of pinsmounted so to be set from one position to another, of series of jacksfor setting said pins, and a guide plate having a series of radial slotsin which said jacks may play so as to permit said pins to force saidjacks out of their path during the rotation of said wheel.

16. The combination with a rotatable wheel having a series of pinssettable from one position to another, of a series of jacks convergingin the general direction of the axis or said wheel and acting to setsaid pins, said jacks being yieldingly nounted so as to be capable ofmoving toward the s of said wheel out of the path of said p. F 1!. Thecombination with a rotatable wheel having a series of pins settable fromone position to another, of a series of jacks for setting said pins, andspring means for yieldingly determining the position or said jacks withrespect to the path of rotation of said pins. I

18. lhe combination with a rotatable wheel having a series of pinssettafle tron one position to another and arranged in the arc oi acircle, of a series of jacks for etting said pins, said jacks havingtheir ends arranged in the are of a circle in apposition to the ends oicertain of said pins, and an annular spring for determining the radialposition of the ends of said jacks with respect to said pins.

19. T he combination with a rotatable wheel having a series of pinssettable from one position to another and arranged in the arc of circle,of a series of jacks for setting said pins said jacks having their endsar ranged in the arc of a circle in apposition to the ends of certain ofsaid pins, and an annular spring located ithin the space inclosed bysaid jacks and yieldingly holding said jacks with their ends inapposition to said pins.

20. The combination with a series of pins settable from one position toanother, or" a series of jacks for setting said pins, and a blade foractuating each of said jacks. said blades having a cam portion toperform the actual work of shifting the said jacks and also having adwell portion to permit a further movement of said blades while saidjacks remain in their actuated position.

21. The combination with a series of 'settable pins, of a series 01"-jacks for setting said pins, and a series of blades for actuating saidjacks, said blades having a cam portion to perform the actual work ofshifting said jacks and also having dwell portions located on oppositesides of the cam portion to enable a relative inactive movement betweensaid jacks and said blades.

22. The combination with a series of pins settable from one position toanother, of a series of jacks for setting said pins, said jacks having apair of spaced pins thereon, and blades engaging between said spacedpins to cam said jacks from one position to another.

23. The combination with a series of settable pins, of a series of jacksfor setting said pins, and a series of blades for shifting said jacks bycainming them from one position to another, said blades all passingthrough a common point so that no two can be actuated at the same time.

2%. The combination with a series of annularly disposed settable pins,of a series of jacks converging toward a common point and capable ofsetting said pins, a guide plate having a series of radially extendingslots for loosely supporting said jacks, an annular spring located so asto yieldingly resist a radial movement of said jacks, and cam bladesengaging said jacks to shift the same to set said pins.

25. In a computing machine, the combination with computing mechanism, ofa master member t ierefor, relatively movable with respect thereto, saidmaster member including a train of connections including a driving partand a driven part, said connections being normally broken, numeral keys,power means, under control of said keys at each stroke thereof, foreffecting a connection between said driving and driven parts, wherebysaid computing mechanism is driven, and means also under control of saidpower means, preventing relative movement of said computing mechanismand master member during a computation.

:26. In a combined typewriting and computing machine, the combinationwith computing mechanism and a master member therefor, and movablerelatively thereto, of a typewriter carriage for controlling said rel-ILLQ ative movement, a dog for determining the travel of said carriage,a source of power for driving said master member, normally brokenconnections between said source of power and said master member, numeralkeys for determining the amount of movement of said master member, andpower means, under control of said keys at each stroke thereof, forrendering said connections effective between said source of power andsaid master member, said power means also controlling said dog forpreventing movement of said typewriter carriage during computation.

27. In a computing machine, the combination with computing mechanism andindexing mechanism therefor, including. a computation wheel havingsettable pins to determine the amount of rotation of said wheel, andthereby of said computing mechanism, of locking means for said computingmechanism, and means brought into action by anyof said pins on reachinga position determining the end of a computation for releasing saidlocking means.

28. In a computing machine, the combination with computing mechanism, ofactuating means for said computing mechanism normally disconnectedtherefrom, numeral keys, indexing mechanism for said computing mechanismcontrolled by said keys, said indexing mechanism including a computationwheel having pins settable to determine the amount of rotation of saidwheel, nd thereby of said computing mechanism, means for connecting saidactuating means with said computing mechanism on the downstrokes of saidnumeral keys, and for setting one of said pins, and means brought intoaction by the set pin at the conclusion of a computation, for renderingsaid actuating means ineffective, irrespective of the position of saidkeys.

29. The combination with a computing mechanism, of locking means forsaid computing mechanism, releasing means for said locking means, asource of power for actuating said releasing means, and a clutch forconnecting said source of power to said releasing means.

80. In a computing machine, the combination with computing mechanism, ofa primary motor for actuating said computing mechanism, normallyinefiective on said computing mechanism, an auxiliary motor for makingsaid primary motor effective, said auxiliary motor being normallyrestrained from action, numeral keys controlling the release of saidauxiliary motor on each stroke of said keys, means for restoring powerin said auxiliary motor from said primary motor, said restoring meansincluding a clutch between'said primary motor and said auxiliary motor,said clutch normally open, a clutch-closing member, means therestoration of power in said auxiliary 7 motor.

31. In a computing machine, the combination with computing mechanism, ofa primary motor for actuating said computing mechanism normallyineffective on said computing mechanism, an auxiliary motor for makingsaid primary motor effective, said auxiliary motor being normallyrestrained from action, numeral keys controlling the release of saidauxiliary motor on each stroke of said keys, means for restoring powerin said auxiliary motor from said primary motor, said restoring meansincluding a connection between said primary motor and said auxiliarymotor, said connection normally broken, means for making said connectiondependent on release of the auxiliary motor and the completion of acomputation, and a cam for breaking said connection on the completion ofrestoration of power in said auxiliary motor.

32. In a computing machine, the combination with computing mechanism, ofa primary motor for actuating said computing mechanism normallyinefiective on said computing mechanism, an auxiliary motor for makingsaid primary motor effective, said auxiliarv motor being normallyrestrained from action, numeral keys controlling the release of said.auxiliary motor on each stroke of said keys, means for restoring powerin said auxiliary motor from said primary motor, said restoring meansincluding a connection between said primary motor and said auxilia-ymotor, said connection normally broken, means for making said connectiondependent on the release of said auxiliary motor at the completion of acomputation, and a cam operated by said primary motor for breaking saidconnection at the completion of the restoration of power in saidauxiliary motor.

33. In a computing machine, the combination with computing mechanism, ofa p imary motor for actuating said computing mechanism normallyineffective on said comput-ing mechanism, an auxiliary motor for makingsaid primary motor effective, said auxiliary motor being normallyrestrained from action, numeral keys controlling the release of saidauxiliary motor on each stroke of said keys, and means for restoringpower in said auxiliary motor from said primary motor on the completionof each computation started by a numeral key.

84:. In a computing machine, the combination with computing mechanism,of a primary motor for actuating said computing mechanism normallyinefiective on said computing mechanism, an auxiliary motor, for makingsaid primary motor efij'ective, said auxiliary motor being normallyrestrained from action, numeral keys controlling the release of saidauxiliary motor on each stroke of said keys, means for restoring powerin said auxiliary motor from said p1- mary motor, said restoring meansincluding a connection between said arimary motor and said auxiliarymotor, said connection being normally broken, and means for controllingsaid connection on completion of a computation.

35. In a computing machine, the combination with computingmechanism, ot'a primary motor for actuating said computing mechan sm normallyinellective on said computing mechanism, an auxiliary motor for makingsaid primary motor cifectivc, said aux iliary motor being normallyrestrained from action, numeral keys controllin the release of saidauxiliary motor on each stroke of said keys, meai tor restoring power insaid auxiliary motor from said primary motor, said restoring meansincludin a clutch between said primary motor and said auxiliary motor, aclutch-closing member, a latch for engaging said member on release ofsaid auxiliary motor, means to move said latch, and thereby said memberto close said clutch on completion of a computation, and means fortripping said latch on restoration. ot power in said auxiliary motor.

36. In a computing machine, the combination with computing mechanism, ofan electric motor for actuating said computing mech anism, a normallybroken circuit for said motor, an auxiliary motor for completing saidcircuit, said auxiliary motor non mally restrained from action, numeralkeys for controlling the release of said auxiliary motor, and means forrestoring power in said auxiliary motor from said electric motm andsubsequently opening said circuit.

37. The combination with a computing mechanism, of an electric motor fordriving said computing mechanism, an electric circuit for said motorhaving a normally open switch, an arm connected to close said switch, acam operating said arm, a sprin opera ting said cam, and numeral keyscontrolling action of spring.

38. The combination with computing mechanism, of an electric motor fordriving said computing mechanism, an electric circuit for said motorhaving normally open switch, arm connected to close said switch, a camoperating said arm, a spring operating said cam, numeral keys iorcontrolling the operation of said computing mechanism, a latch forpreventing the operation of said spring, and means to enable saidnumeral keys to release said latch.

39. The combination with a computing mechanisnnot an electric motor fordriving said computing mechanis an electric circuit to said motor havinga normally open switch, an arm connected to close said switch, a cam foroperating said arm, a rack connected to said cam, a sector engaging saidrack, an arm connected to said sector, a latch on said last-mentionedarm, a. lock engaging said latch, a spring for actuating said rack,numeral keys controllin the action of said computing mechanism, andconnections enabling any one of said numeral keys to release said latchto enable said spring to act to close said clutch.

ll). In a computing machine, the combination with computing mechanismincluding a computation member having index pins settable therein todetermine the amount of movement or said computing mechanism, of aprimary motor for actuatin said computing mechanism normally ine lectiveon said computing mechanism, an auxiliary motor for making said primarymotor effective, said auxiliary motor being normally restrained fromaction, numeral keys controlling the release of said auxiliary motor oneach stroke of said keys, means for restoring power in said auxiliarymotor from said primary motor on the completion of each computationstarted by a numeral key, said restoring means including a clutchbetween said primary motor and said auxiliary motor, a clutch-closingmember, a shifter for said member, and means for engaging said member onrelease of said auxiliary motor and moving said shifter into the path ofth set index pin, so that said pin on completion of its movement willactuate said shifter and through it said clutch-closing member andclutch to close the same, to connect said primary motor to saidauxiliary motor to restore power in the latter.

41. The combination with a typewriting mechanism including a travelingcarriago, oi a computing mechanism, a series of unmeral keys forcontrolling the action or" said computing mechanism, means to enable thereturn of said numeral ke s after ha= ng been depressed to start acomputation before the computation is completed, and locking means forpreventing said carriage after said numeral keys hav been returned to anormal position and be fore said computation initiated by any one of:said numeral keys has been completed.

mechanism, of numeral keys for controlling the action of said computingmechanism, mechanical connections between said numeral keys and saidcomputing mechanism, enabling the operation and control of saidcomputing mechanism by said numeral keys, and means to enable the returnof said numeral keys after having been depressed to start a computingaction at any time before or after the computing action has been comthemovement of z. The combination with a computing pleted, a travelingcarriage for determining the denominations of said computing mechanism,and locking means for holding said carriage against movement during acomputing action.

43. In a computing machine, the combination with computing mechanism, ofa source of power for actuating said compu ing mechanism, normallyinefiective connections between said source of power and said computingmechanism, a spring for rendering said connections eli'ective, saidspring being normally restrained from action, numeral keys controllingthe release of said spring on each stroke of said numeral keys, and atrain of driving connections from said source of power for storing uppotential energy n said sprin M. In a computing machine, the combinationwith computin mechanism, of a source or" power for actuating saidcomputing mechanism, normally ineflective connections between saidsource of power and said computing mechanism, a spring for renderingsaid connections effective, said spring being normally restrained fromaction, means for retensioning said spring before disconnectin saidsource of power, and means for disconnecting said source of powersubsequently to the retensioning of said sprin 45. In a computingmachine, the combination with computing mechanism, of a primary motorfor actuating said computing mechanism, said computing mechanismincluding a series of pins settable to determine the extent of acomputation, an auxiliary motor normally restrained from action, andnumeral keys for controlling the setting of said pins and for releasingsaid auxiliary motor on each stroke of said keys, said auxiliary motoracting when released by any key to unset a previously set pin.

46. In a computing machine, the combination with computing mechanismincluding an indexing device having a series or pins settable todetermine the extent of a computation, of a primary motor for actuatingsaid computing mechanism normally inefiective on said computinmechanism, an auxiliary motor for making said primary motor effective,said auxiliary motor normally restrained from action, and numeral keyscontrolling the setting of any pin and for releasing said auxiliarymotor, said auxiliary motor also acting to unset a previously set pin.

47. In a computing machine, the combination with a computing mechanism,of a motor for driving said computing mecha nism, a train of gearingconnecting said motor with said computing mechanism, having a point ofinterruption whereby said computing mechanism may be disconnected fromdriven relation with said motor, and

a train of gearing driven from said firstmentioned train of gearing at apoint intermediate said point of interruption and said motor so as to befully operative, and connected to break said first-mentioned train ofgearing at said point of interruption when a computing action by saidcomputing mechanism is finished.

48. In a computing machine, the combination with indexing mechanism, ofa motor for driving said indexing mechanism, a train 01" gearingconnecting said motor with said indexing mechanism, having a point ofinterruption whereby said mechanism may be disconnected from drivenrelation with said motor, a train of gearing driven from saidfirstanentioned train of gearing at a point intermediate said point ofinterruption and said motor so as to fully operative, and connected tobreak said first-mentioned train of gearing at said point ofinterruption when an action by said indexing mechanism is fini hed, anda separate source of power for completin said firstmentioned. train oi":gearing at said point of interruption.

49. In a computing machine, the combination with an indexing mechanism,of a motor for driving said mechanism, a train of gearing connectingsaid motor with said mechanism, having a point of interruption wherebysaid mechanism may be disconnected from driven relation with said motor,a train of gearing driven from said first-mentioned train or gearing ata point intermediate said point of interruption and said motor so as tobe fully operative and connected to break said first-mentioned train ofgearing at said point of interruption when an action oy said indexingmechanism is finished, a separate source of power for completing saidfirst-mentioned train of gearing at said point of interruption, andmeans driven by said motor through the intermediary of saidsecond-mentioned train of gearing for storing up energy in said separatesource of power.

50. In a computing machine, the combination with an indexing mechanism,of a motor for driving said mechanism, a train of gearing connectingsaid motor with said mechanism, having a point of interruption, asecondtrain of gearing driven from said first mentioned train of gearing at apoint intermediate said motor and said point of interruption so as to befully operative and arranged to control the completion or continuity ofsaid first-mentioned train of gearing dependent on the action of saidindexing mechanism, and means for breaking the continuity of saidsecond-mentioned train of gearing after it has completed acontrollingaction of said first-mentioned train of gearing. r

51. In a computing machine, the combination with an indexing mechanism,of a motor for driving said mechanism, a train of gearing connectingsaid motor with said mechanism and having a point of interruption, asecond train of gearing driven from said first train of gearing forcontrolling the continuity of said first train of gearing at said pointof interruption, and means for automatically bringing said second trainof gearing into effective action to control the continuity of said firsttrain of gearing at a predeterminded point in an action of said indexingmechanism.

52. In a computing machine, the combination with an indexing mechanism,of a motor for driving said mechanism, a train of gearing connectingsaid motor with said mechanism and having a point of interruption, asecond train of gearing driven from said first train of gearing forcontrolling the continuity of said first train of gearing at said pointof interruption, and means for automatically brin ing said second trainof gearing into elfective action to control the, continuity of saidfirst train of gearing either one of said computing heads and itscorresponding master means are not in correct register, the one with theother.

56. In the computing machine, the combination with a primary indexingmecha nism, of a motor for driving said mechanism, a clutch forcontrolling the drive of said mechanism by said motor, and a secondclutch for controlling the open or closed condition of said firstclutch.

57. The combination with a computing mechanism, of a motor for drivingsaid mechanism, a clutch having a variable period of action fordetermining a variable period of drive of said computing mechanism bysaid motor, and a single-acting clutch having a definite period ofefiectiveness for controllin the effectiveness of said first-mentionedclutch.

58. The combination with one or more computing sets, each including aseries of computing wheels and a master wheel for driving said computingwheels seriatim, said ,master wheel and said computing wheels 'having arelative traveling movement to a predetermined point in an indexingac-Ebring said master wheel into successive regtion of said indexingmechanism, said second train of gearing automatically severing themastery over said first train of gearing after it has completed acontrolling action thereof.

53. In a computing machine, the combination with an indexing mechanism,of a motor for driving said mechanism, a train of gearing connectingsaid motor with said mechanism, a second train of gearing driven fromsaid fir t train of gearing, and means operated by said mechanism duringan indexing action enabling said second-mentioned train of gearing toautomatically control the effectiveness of said first-mentioned train ofgearing to drive-said indexing mechanism.

The combination with a computing mechanism, of a carriage traveling tocontrol the denominations of said computing mechanism, an cscapement forcontrolling the movements of said carriage, numeral keys for controllingthe action of said escapement and the action of said computingmechanism, and locking means for said escapement controlled from saidcomputing mechanism.

In a combined typewriting and compatin machine, the combination with aplurality of computing heads and a typewriter carriage, one of saidcomputing heads being mounted on the carriage and the other beingmounted for reciprocation with rect to said carriage, or master meanscotp rating with "each computing head, numeral k ys cont-rolling theextent of movement of. said master means, and means to prevent movementof either of said master means to effect a computing aetia'm when "isterwith each of said computing wheels, of an indexing device forcontrolling the ex tent of rotation of said master wheel, said Iindexing device including a series of pins settable to determine theextent of movement thereof and normally having a pin t to determine thepassivity of said indexing device, numeral keys controlling the settingof any pin, means also controlled by said keys for upsetting said setpin, and locking means for preventing the unsetting of: said pin by saidlast-mentioned means when any of said master wheels is not in exactregister with one of the accordant computing wheels, while leaving saidkeys free to et a pin.

59. The combination with a computing set including two primary elements,to wit, a series of computing wheels and a master wheel, said primaryelements having a relative traveling movement to bring said master wheelinto successive register with each of said computing wheels, of a motorfor driving said master wheel, numeral keys for controlling the drive ofsaid master wheel by said motor, a switch closablc at the actuation of anumeral key to complete the cireuit to said motor and start the same inaction, and locking means for preventing the closing of said switch whensaid master wheel overlaps more than one computing wheel, while leavingsaid keys tree to control the drive of said master wheel by said motor.

60. The combination with a computing mechanism including two primaryelements, to wit, a series of con'ipu-ting wheels and master wheel, saidmaster wheel and said computing wheels having relative travel ingmovement to bring said master wheel into successive register with eachof said computing wheels, of a motor for driving said computingnechanism, numeral keys for determining how far the computing mechanismshall be driven by said motor, and means for preventing the drive ofsaid computing mechanism by said motor when said master wheel overlapsmore than one computing wheel, while leaving said keys tree to determinehow far the computing mechanism shall be driven.

61. The combination with acomputing mechanism including two primaryelements, to wit, a series of computing wheels and a master wl eel, saidprimary elements having a relative traveling movement to bring saidmaster wheel into successive register with each of said computingwheels, 01"- a motor for driving said computin mechanism, said motorbeing normally silent, a train of gearing connecting said motor to saidcomputing mechanism, said train of gearing being normally interrupted,indexing devices to determine how far said computing mechanism shall bedriven, a series or" numeral keys for setting any indexing device andfor controlling both the completion of said train of gearing and theinciting of said motor to action, and locking means for preventing thecompletion of said train 01" gearing and the inciting of said motor toaction when said master wheel overlaps more than one computing wheel,while leaving said he s free to control said indexing devices.

62. In a'computing machine, the combination with indexing mechanism, ofa motor for driving said mechanism, a train of gearing from said motorto said mechanism, being normally interrupted, a clutch for completingsaid train of gearing, a circuit to sait motor and normally interrupted,a switch for closing said circuit, series of numeral keys forcontrolling the action of said indexing mechanism, means forconcomitantly closing said clutch and said switch at the down stroke ofa numeral key, mechanism for shifting said means out of action, andconnections actuated by said indexing mech anisin to enable theactuation of said lastmentioned mechanism at the completion of eachoperation of said ind xing mechanism.

63. In a computing machine, the combination with an indexing mechanism,of a motor for driving said mechanism, a train of gearing from saidmotor to said mechanism, being normally interrupted, a clutch forcompleting said train of gearing, a circuit to said motor and normallyliterrupted, a switch for closing said circuit, a series of numeral keysfor controlling the action of said indexin-ginechanism,'means forconcomitantly closing said clutch and said switch at lllQdOWIl stroke ofa numeral key, mechanism 'ff'or shifting said m ans out of action,connections actuated by said indexing mechanism to enable the actuationof said last-mentioned mechanism at the completion of each oper. tion ofsaid indexing mechanism, and means for rendering said connectionsineffective after having completed their functions.

64:. In a computing machine, the combination with a computing mechanism,of a mo tor for driving said computing mechanism, an indexing mechanismto determine the amount of movement of said co nputing mechanism by saidmotor, a normally open train of connections between said motor and saidindexing mechanism, a clutch for closing said train of connections, aseries of numeral keys for controlling the action 01 said indexingmechanism, and means for closing said clutch at the actuation of anynumeral icy at a predetermined point in the down stroke of such key. 7

65. In a computing machine, the combination with a computing mechanism,of a motor for driving said computing mechanism, an indexing mechanismto determine the amount of movement of said c mputing mechanism by saidmotor, a normally open train of connections between said motor and saidindexing mechanism, a clutch for closing said train of connections, aseries of numeral keys for controlling the action of said indexingmechanism, means for closing said clutch at the actuation of any numeralkey at a predetermined point in the down stroke of such key, and meansfor opening said clutch at the completion ot a computation irrespectiveof the further movement of the actuated numeral key after the closing ofsaid clutch.

66. In a computing machine, the combination with a computing mechanism,of a motor for driving said computing mechanism, indexing mechanism todetermine the amount of movement of said computing mechanism by saidmotor, a normally open train of connections between said motor and saidindexing mechanism, a clutch for closing said train of connections, aseries 01 numeral keys for controlling the action of said indexingmechanism, means for closing said clutch at the actuation of any numeralkey at a predetermined point in the down stroke of uch key, and meansdriven from said motor and controlled from said computing mechanism foropening said clutch at the end of a computation.

67. In a computing machine, the combination with a computing mechan sm,of a motor for c riving said computing mechanism, an indexing mechanismto ClStGllDlll the amount of movement of said computing chanism by saidmotor, normally open train of connections between said motor and saidindexing mechanism, a clutch "for

